Gitlab Runner Image does not work with registration token

After following the instructions at https://docs.gitlab.com/runner/install/kubernetes.html I discovered after much testing that you can't put a registration token into the config.toml configuration. Only a regular token works, and there is no way to generate this in the Admin UI as far as I can see.

Consider documenting this fact so others don't waste their time, and include a method to generate a token in the GitLab admin UI to fulfil this requirement.